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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.editors.text;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.jface.resource.JFaceResources;
/**
* A "button" of a certain color determined by the color picker.
*
* @since 2.1
*/
class ColorEditor {
/** The extent. */
private Point fExtent;
/** The image for the push button. */
private Image fImage;
/** The current RGB color value. */
private RGB fColorValue;
/** The current color. */
private Color fColor;
/** The image push button which open the color dialog. */
private Button fButton;
/**
* Creates and returns a new color editor.
*
* @param parent the parent composite of this color editor
*/
public ColorEditor(Composite parent) {
fButton= new Button(parent, SWT.PUSH);
fExtent= computeImageSize(parent);
fImage= new Image(parent.getDisplay(), fExtent.x, fExtent.y);
GC gc= new GC(fImage);
gc.setBackground(fButton.getBackground());
gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
gc.dispose();
fButton.setImage(fImage);
fButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
ColorDialog colorDialog= new ColorDialog(fButton.getShell());
colorDialog.setRGB(fColorValue);
RGB newColor = colorDialog.open();
if (newColor != null) {
fColorValue= newColor;
updateColorImage();
}
}
});
fButton.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
if (fImage != null) {
fImage.dispose();
fImage= null;
}
if (fColor != null) {
fColor.dispose();
fColor= null;
}
}
});
}
/**
* Returns the current RGB color value.
*
* @return an rgb with the current color value
*/
public RGB getColorValue() {
return fColorValue;
}
/**
* Sets the current RGB color value.
*
* @param rgb the new value for the rgb color value
*/
public void setColorValue(RGB rgb) {
fColorValue= rgb;
updateColorImage();
}
/**
* Returns the image push button.
*
* @return the button which shows the current color as image
*/
public Button getButton() {
return fButton;
}
/**
* Updates the color of the button image.
*/
protected void updateColorImage() {
Display display= fButton.getDisplay();
GC gc= new GC(fImage);
gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4);
if (fColor != null)
fColor.dispose();
fColor= new Color(display, fColorValue);
gc.setBackground(fColor);
gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
gc.dispose();
fButton.setImage(fImage);
}
/**
* Computes the size for the image.
*
* @param window the window on which to render the image
* @return the point with the image size
*/
protected Point computeImageSize(Control window) {
GC gc= new GC(window);
Font f= JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);
gc.setFont(f);
int height= gc.getFontMetrics().getHeight();
gc.dispose();
Point p= new Point(height * 3 - 6, height);
return p;
}
}
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